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How to declare a global int in iPhone app
AppDelegate.h

 int maxglobal;

@property (assign) int maxglobal; // define this in app delegate

int maxglobal; // define this outside any class and it's "global"

AppDelegate.h:
@interface AppDelegate{
    int maxglobal;
}
@property (nonatomic, readonly) int maxglobal;

AppDelegate.m
@implementation AppDelegate
@synthesize maxglobal;

extern int maxglobal;